We will probably have to replace our 12yo Hayward 1.5HP Superpump when we open this weekend. It died just as we were closing last year & was making terrible noised & shutting down sporadically just prior. I've googled all around this forum & the internet & gotten myself more & more confused.

Is a dual speed really more energy efficient and quieter than a single? I've read conflicting info. (As for variable, that's out of budget). If we did replace with a dual speed, what HP would we need? I read something about uprating??

We have a 27K in-ground vinyl with 1 waterfall; Hayward sand filter.